function Map(el){
    this.el = el
    this.width = 800
    this.height = 400
    this.init()
}
Map.prototype.init = function(){
    this.el.style.width = this.width + 'px'
    this.el.style.height = this.height+ 'px'
    this.el.style.background = 'url(./bg.png)'
    this.el.style.border = '10px solid gray'
    this.el.style.position = 'relative'
}